<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .Cat {
            margin: auto;
            width: 200px;
            height: 200px;
            background: url("images/cat-3-steps.png") no-repeat;
            background-size: cover;
            animation: catRun .5s steps(3) infinite;
        }
        @keyframes catRun {
            100%{background-position: 0 100%}
        }
    </style>
</head>
<body>
<div class="Cat"></div>
</body>
</html>